Measuring pump with flexible tubing



.Buy 31, 1951 L, .I. HENRY 2,562,552

' MEASURING PUMP WITH FLEXIBLE TUBING Filed July so, 1947 4 sheets-sheet1 FHM 23 79 I Iv-g, I 39 o as 49 55 4B l Bef/36 W A. 1

3e 32 ne F5 .3 31 79 2 33 /32 34' 30\ f `Fuly 31, 1951 L. J. HENRYMEASURINGPUMP WITH FLEXIBLE TUBING 4 Sheets-Sheet 2 Filed July so. 1947FIGA- July 31,1951 J. HENRY 2,562,552

l MEASURING PUMP WITH FLEXIBLE TUBING Filed July .'50, 1947 4Sheets-Sheet 3 Fls FIC-).9

July 31, 1951 J. HENRY MEAsuRING PUMP WITH FLEXIBLE TUBING 4Sheets-Sheet 4 Filed July 50. 1947 Patented July 31, 19.51

uuiTED STATES PATENT OFFICE 2,562,552 MEASURING PUMP WITH FLEXIBLETUBING Louis Joseph Henry, Paris/France AppriatibnJuiy'so,1947,.,seria1- No. 764,760" In France March 11,1941

Section LPublficA Law 690, vAugust 8, 1946 Patent expires March '7, 19619 claims. (o1. 222-418) being: correlated Vin Suche manner that theilexible tubing element which Vis thussubjected to theaction ,ofsaidmembers will behave-as a suctionor pressure pump barrel.

My pump makes it possible to, inject a pluralvity of liquids, Orliquidson one hand and any desired gases onthe other hand, in variable amountsaccording to the desires of the operator.

.The volume of flow of each of said liquids or 20 gases injected in thisway is adjustable for each individual tube without it Ybeing required toVary the speed of the motor provided to drive the pump.

As a result of the above-disclosed features, the pump according to myinvention, makes it possible,.fcr instancato transfuse within agiventime .300 cc. vof blood, and in the samelapse of.

time and simultaneously therewithinject 10 cc.

Any -important feature of my new device is that the iliquids or gasesbeing pumped do not enter into contact .with any .valve ortho likemeans: :they flow through simple rubber tubes which do not require anyflubrication, as vdistinguished from .alternating pumps, vaned pumps,gear pumps, and the like. Inthis manner any `possi- .'bility .of :theproducts flowing in the apparatus mingling ywith foreign materials i spositively Dre- -clud`ed, this being of capital importance in medicinalapplications.

A.Positioning and removal or the tubesmay be eieojted with thegreatestof easewithout requiring the dismantling@ any mechanical member.`ltthus becomes an easymatterto cleanand sterilze 'the tubes wheneverVnecessary or desir- My apparatusmay bejormed with anysuitable .numberof tubes. literals' by way 401E example. there is described vhereinafteran apparatus comprisinggtwo tubes `as diagrammatically shown yin theaccompanying drawing:

j.- Fig, 1 is an elevational View of the apparatus assembly with partsbroken away and in cross :125 section Online I-,I 0f Fig. 5-

Fig. 2 is across section on line VII--II of Fig. 4

-n itS,; leit-lnand side and an end i'iewy 0f the pump .proper initsrighthand side. t

Fig., 13 is aside view of the same pump, one

ci an anaesthetic, the apparatus in such case 3 0 ...Se 40f .the .basebeing brOkIl @Warte Show@ comprising two tubes. The products may beinjected separately, that is they may be introduced into differentpoints of the patients body; both tubes could also be connected with asingle hypodermicncedle, the proportioning of the injected uid thenbeing veffected within the single tube interconnecting both theabovementionedtubes.

My apparatus may operate either -asfauartiiicial heart (theoutput ofboth tubes .then vbeing alternated, one` or the tubes being caused to1aspirate while the other one discharges) oraspira'- tiony and dischargemay be eectedsimultaneously, in which oase my apparatus may constitute ametering-mixing device in whichboth products being pumped are 'mixed-infpredter? mined proportions through adjustment of both ratesoi iiow andthroughout the entire-.duration ofthe discharge period.

As will be apparent fromthedisclosureeiven hereinafter in greaterdetail, the adjustmentgof ,Y

such adjustment being operable both C atrest-:and

when the apparatus is in use.

detail.

.Eig. -4 s hOWSVthe vsaine device partly in cross section OnlineIV-fIfQf Figi 2 ne, 5,15, in itsupper pain-ascensori une v-v of Eig. .fi, .and in its bottom part a section on line Fig. 46 shows thepcsitionoi the'control Acams controlling the obturating push-rods of oneof .the .t ubes ,at the start of the suction phase.

'T shows the position of the control cams of the obturating push-rods ofthe other tube at the start of the delivery stroke.

elevation respectively one of the supportsof the tubeabutment plate,saidsupport atthe same time serving foradjustingpurposes.

Fig l2 is an endview ofthe counter with which theiapparatusisprovided.Figs. 13 and 14 respectively are ay bottom; plan View and anelevationalView oisaid counter. Figs. l5 and l-farean elevational and a-plah .yieWrespectively of a ,detail Yof thecounter.

Ytling of the tubes 21. -ofcheck-valves and are operated alternately,one

synchronizing the suction and delivery strokes' or periods in each tube,or on the other hand for causing them to alternate, depending onparticular requirements.

The device is supported on a base I which in turn serves as a supportfor a shaft 2 on which are secured cams 3, 4, 5, 6, (and 3', 4', 5', 6forv the other tube). The shaft 2 is driven in rotation at a constantrate from an electric motor accommodated under the apparatus within acasing 1I upon which the base I is secured. Particular features of thecontrol means from said Vmotor will be given hereinafter.

The cams 3, 4, 5, 6 are engaged by one end (which may be provided with afollower roller) Vof levers 1, 8, 9, I rigid with pins II, I2, I3 and`I4 which also support levers 1', 8', 9', Ill' actuating push-rods ormembers I5, I6, I1 and I8 respectively.

' The end push-rods I1 and I8 (see Fig. 5) are adapted to effect at therequisite moments throt- They serve the function of them pressing uponthe tube to throttle it while the other one releases the tube to enableliquid or gas to iiow freely therethrough.

The push-rods I1 and I8 are slidable in xed guides and are maintained inengagement with.

their controlling levers 9 and I9' by springs I1' and I8 which at thesame time are adapted to maintain the levers 9 and ID pressed againstthe cams and 6.

The push-rods I5 and I6 located between thel push-rods I1 and I8 areeffective to flatten the tube 21 in the length thereof included betweenthe end push-rods, in order to effect the discharge ofthe liquid or gascontained in the tube. Said push-rods I5 and I6 are connected with apressure-plate I9 along which they are movable, the connection betweensaid push-rod and said plate being for instance effected through adovetail assembly which may best be seen in Fig. 1. The push-rods I5 andI6 are actuated synchronously by the levers 1' and 8 which in turn arecontrolled from the related cams and the thus obtained displacement ofthe push-rods and the plate I9 towards the tube 21 causes said tube tobe clamped between the plate I9 and a fixed abutment plate 28.

When the plate I9 has reached the end of its `stroke or in other wordswhen the discharge of a desired amount of liquid or gas has beeneffected by displacement of the plate I9, the latter is retracted by theaction of a spring 24 acting through the medium of a link and a lever 26upon a rod 24 guided in a recess formed in the post 23 and formed withan aperture 24'. It will be easily understood that the action of thespring 24" also results in maintaining the levers 1 and 8 constantlyapplied against the cams 3 and 4 from which they are controlled.

The just described control devicefor the plate I9 is devised so as topermit of adjusting the various gauges or thicknesses.

rate of iiow through the tube 21, such adjust. ment being effected byvarying the amplitude of stroke of the plate I9. For that purpose, aspreviously stated, the push-rods I5 and I6 are movable along the plateI9. It follows that said vpush-rods according to the position occupiedby them relatively to the central rod 24, are engaged by a point of thelevers 1 and 8 which is more or less distant from the fulcrum axis ofsaid levers. Consequently, the stroke of the pushrods I5 and I6 (andtherefore that of the plate I9 with which they are combined) is alsomodified.

For such adjustment, it is necessary that the push-rods I5 and I6 bedisplaced by strictly equal amounts. For that purpose the displacementof the push-rods is controlled by a screw 20 formed with threads ofopposite pitch acting upon the guides I5 and I6 of the push-rods I5 andI6. By rotating the screw 20 by means of the knobs 2l and 2I asimultaneous displacement in opposite directions by equal amounts isobtained for the guides I5' and I6 and therefore the pushrods I5 and I6.Such movement being effected either in a direction to bring thepush-rods closer to the pivotal axis of the levers 1l and 8 or to spacesaid push-rods further away from said axis.

The screw 23 is rotated in the walls 22 and 22' of the apparatus and ismoreover supported in the central post 23. It may be provided withblocking means to set it in a required position.

The screw 2U could be replaced by a rapid adjustment device formed by apinion rotating on the member 23 and meshing with sets of rack teeth oneof which is rigid with the guide I5 and the other with the guide I6. Byrotating the pinion, movements in opposite directions are imparted tothe guides, which movements may be faster than those obtained with thescrew having threads of opposite pitch as described previously.

The rubber tube 21 which so to speak forms the body or barrel of thepump, and on which the push-rods I1 and I8 act in the manner ofcheck-valves, is clamped for the purpose of discharging the fluidcontained therein, between the movable plate I9 and the fixed abutmentplate 2S, as stated above. The abutment plate 28 remains stationarythroughout the operation of the apparatus, but may be mounted so as tobe adjustable and also to be foldable as will now be explained.

Adjustment of the plate 28 makes it possible to adapt the device for usewith rubber tubes of Such adjustment is obtained by means of thefollowing device.

The plate 28 is through the medium of a pin 29 mounted on two supports30 and 30 which are freely slidable on the base I, said supports beingguided by the side edges of the ports I which are engaged by theextensions 30"' of the supports 30 and 30'. Said extensions are formedas forks into which project levers 35 and 35 rigid with the shaft 36,rotatable on pins 31 and 31 rigid with the base I, as best shown inFigs. 2 and 3. A lever 38 is rigid with the shaft 36 and said lever isengaged by a set-screw 39, which screw may be actuated by means of anadjusting knob 4D and is threaded into the side wall of the base I. Thesupports 30 and 30' are maintained in place on the base frame I by meansof strap members 4I and 4I with which they are made rigid through screws42 or any suitable equivalent means.

It will be readily understood that when the screw 39 is actuated theassembly comprising the estes-eg supportsU .'50v and 3B' and theabutment plate-28, may be advanced or retracted and consequentlythepush-rods l `and I6 may be made to suiiciently flatten down the tube21 to obturate it Without however crushing it to the point of injury,whatever the thickness of said tube may be.

Moreover, the abutment plate 28 may be completely folded back to enableremoval or insertion of the rubber tube 21. For that purpose said platemay be rotated about the axis 29 to assume the position indicated at theleft of Fig'. 1. As shown in this figure, the supports 35 and 30 areformed with notches 3U, therebyenabling the tube 21 to be inserted (orremoved) when the abutment plate'28 is in folded back condition. As aresult of this arrangement, positioning and removal of the tube may beeiected without even having to look at it and possibly in completedarkness.

The abutment plate 28 is maintained in its operative position (as shownat the right of Fig. 1) by two'latches 32 and 32 (See in particular Fig.5) engaging recesses 3l and 3l' formed in the supports 30 and 58'; aspring 33 urges the latches into their recesses; actuating lugs 311 andSil' formed at the ends of the latches allow them to be extracted fromout of their recesses by compressing the spring 33 when it is desired toclear the abutment 28' in order to remove or insert a tube 21. When thelatches engage their recesses, they are effective to block Vthe abutmentplate 2B in the position to which it has been brought in theabove-described adjustment and they enable it to withstand the pressureexerted by the tube 21 when the latter has been compressed by thepush-rods I1, I8 and the pressure plate I9.'

Itis important that the operator have a correct knowledge of the amountby which the rate of flow through any given tube is altered when the setscrew 2li causing longitudinal displacement of the guides l5 and It andthereby the push-rods I5 and I6 together with the plate i9, is actuated.This result is obtained by means of an indicating device (Fig. 18)comprising an indicator arm or needle 45 movable in front ofV agraduated scale on a dial. If said indicator arm were displacedproportionally with the amplitude of dispalcement of the guides i5 and I6 it would be necessary to provide a non-uniform spacing between thescale-graduations of the dial, since the rate of flow through acylindrical tube is not varied in a directly proportional manner inresponse to the degree of Iiatening to which it is subjected by beingclamped against a planar surface. To overcome these drawbacks acorrecting device is provided which comprises a cam 43 mounted on thewall of the base l by means of a pin 44 on which it is freely rotatable;said cam is engaged by a finger 45 rigid with any one of the guides I5or I6. It will easily be understood that the contour of the cam 43 maybe so calculated that the indicating arm d6 will be caused to travelthrough equi-spaced scale graduations even though the correspondinglength of stroke of the cam controlling guide may have been subjected toirregular variations.

It goes without saying that without altering the basic organization ofthe invention, it would be possible to actuate through the medium of agearing or a gear train controlled from the cam 43, a second indicatorarm serving to indicate a fraction ofthe main scale graduations. Alsotwo cams could be used each controlled from one of theguides I5 and I6'so as to make it possible to ascertain without requiring anycalculations,

tnefrateloffnw for a predetermined adjustment throught two` tubes ofdifferent diameters.'

The device moreover' comprisesla flow registeringandtotalizingdevice'adpated to automatically compensate for'anydeviationsinthe rate of flow such as may .be causedv by the displacement-ftheguides I5 and I6. Saiddev'ice is essentially formed'bya counter 41 ofany suitable type-con-` trolled byaV lever llvadaptedto transmit to itthe impulses' 'received from a toothed ratchet 49: adapted to rotate thedrum` of the counter byanamountfequivalent to one digit per tooth.V

l'Iheratcliet-lilV1 is Vdriven through amechanical connection formed bya spring 50 having-juntaposed turns wound-around a cylinder 5l rigidwith the ratchetllil'yandl one end of which isy blocked by means ofavscrew '52 on a lever52insuch a way thateach impulseofthe iever 52 whichtendslto' tighten the spring 5d around the cylinder 5| causesthe latterto be rotated,-whi1e in thereverse movement, tending tounwind orrelease" the spring -ythe latter mayA rotate freely around the" cylinder5l without-driving "the latter. Y n

*A' second spring 535wo'und in an opposite direc'` tion around thecylinder 5I and one end of 'which' is blocked on theframe 54 of thedriving device with a s'crew5", allows the ratchetjfl!) to-'be' rotatedfreely whenl urged by the spring 5B, but effectively blocks theratchetwhen lthe spring! 50 is moved in the reverse direction.

1A-link25 connectstheflever 52 on which it acts through the medium ofapin 55, Vwith a lever-'2G to which it is xed by a pin 56; the'leveri-Z-is pivote'd on the base l by means of a pin 28 andreceives the impulsesfrom the guide rod '522' formed for that purpose (as previously stated)with an aperture-245' into'which extends thelfree end oftl'1'e---lever'2'5.Y Areturnspring- 24v (Fig-'sb' 1\3- and 14) rigid atone of its ends withA thel lever' 52 vrand -at its oppositeend withv aVratchet wheel 51 adapted to Vbe blocked by means ofa pawl- 58 pressed bya spring 58 and rotatable on the' pin'59 rigid with? the frame5fi,'retrac'ts the'. lever 52 after each impulse received. from theplate {Sith-rough the guide rod '2G from the lever 2B and the link 25;saidv spring at the same time ret'racts the vplate I9 against thepush-rods l5 and i$,which in-turn act upon the levers.1-1" and B- toapply them against the earns- 3; and/l; The ratchet wheel 5T which isrotatableon the pin 60 carried bythe frame 54' enables adjustment of thetension of the return spring 2li".

As explained in greater .detail hereinafter', the above describedcounter functions as a totalizer' for fractions of a digit.

The frame 54 (which supports theratchet 51 and related elements) and thecounter 'e1 are secured on-.theicasing' El supporting the base l andserving-to house anV electric motorZ controllingthed'evice.

The motor 62 has beenespecially devisedfor: use in connection with myapparatus as used for medicinal purposes. This specific application ofthe device requires an arrangement such as to positively preclude thepossibility of any contact at any time between the oil necessary tolubricate the motor and the members through which the liquids or gasesto be injected are circulated. This'result is obtained according to theinvention through the useof an oil chamber 63 devised sowas toproducethe lubrication of a train of gears without necessitating renewal orreplenishing of ther lubricant. To that endf a suiiiciently large amountofthe latter isV contained in the lower part of the motor casing whichforms a sump or chamber 63 the shape of whichis determined so that theoil level may at no time reach the bearingk for the motor drive shaft,which bearing seals said chamber, and this being true for any positionof the motor. In other words, the apparatus may be turned upside down,or placed on its side, or generally may be madeto assume any positionwhatever without the possibility of any oil escaping through thebearing, said chamber being moreover completely oiltight everywhereelse.

In order to prevent the oil from rising in the motor under the effect ofair pressure, resulting from the heat evolved in the motor in operation,there is provided a tube through which the motor chamber is vented tothe atmosphere; said tube is arranged in such a way that the level ofoil can never` reach its inlet in the chamber.

Said special motor is also characterized Yby an arrangement ensuring aparticularly eicacious guiding of its shaft. As shown in Fig'. 1, thedrive shaft proper 65 driven from the rotor 64 is a tubular shaft; it issupported in a lower bearing 66 and guided in an upper bearing 61. Saidshaft has secured thereon a pinion 68 which engages one or more pinions69 rigid with pinions 10 which in turn drive a pinion 1I rigid with ashaft 12 rotatable within the tubular shaft 65. Said shaft 12 rests on athrust bearing 13; it is guided throughout its entire length and drivesthe shaft 2 carrying the control cams.

In a modification of the device, the connection between the shaft 12 andthe shaft 2 is effected through a free-wheel arrangement allowing theshaft 2 to be rotated by hand without driving the motor. f

In the above the control of only one tube 21 has been described; theapparatus illustrated is provided with two tubes, and, as stated above,the mechanism described is simply duplicated, with the exception of themotor and the shaft 2, which in this case supports a second set of cams.

The pump may be operated to suck and discharge synchronously oralternately through both tubes (in the latter case one tube effectsaspiration while the other one discharges). This result may be obtainedvery simply by means of the device now to be described and moreparticularly illustrated in Figs. 8 and 9.

In order to modify the manner of operation of the pump, it is simplynecessary to change the setting of the second set or trains of cams 3',4', 5', 6 designated by the general reference 14 in Fig. 8. For thatpurpose, said set of cams is driven by means of a retractable key 15accommodated in a chamber 15' formed in the thickness of the shaft 2 andsubjected to the action of two springs 16 and 16' which urge it intoengagement, according to requirements, in either one of two grooves 11or 11' formed in the thick.- ness of the set of cams.

The previously mentioned cams 3, 4, andv 6 form a first set or trainrigid with theshaftZ; the second set of cams 14 may, with respectto saidfirst train, be so adjusted that theaction Iof both tubes may besynchronized or? on the other hand alternated. To modify the setting ofthe train of cams 14, there are provided flats 18, 18 extendingperpendicular toeach of the grooves 11 and 11 as shown in Fig. 9, saidflats making it possible to expose said grooves while being intangential relation with the'innerfdi- .ameter of the bush in which theshaft 2 is roltatable. A push-rod 19 formed-by a 4plate bent of thelatches 32 and 32.

in the form of a U (Figs. 8 and 9) is arranged to extend between eachpair of cams of the train 14 so that'it may, when caused to slide in itshousing formed in the post 23, engage the retractable key 15 to expel itfrom out of that one of the grooves in which it is engaged. A spring 80restores the push-rod 'I8 to its rest position when no longercompressed.

It will readily be understood that if the pushrod 19 is pressed whilethe shaft 2 is rotated. the ends of the push-rod will, at the instantwhere the fiat is presented before them, engage the key 15 and willexpel it from out of the groove in the train of cams 14; the latter willthen no longer be driven through the key 15 and will stop, since thepush-rod, through the pressure exerted by it on the flat, williniznobilize said set of cams, the shaft 2 still remaining freelyrotatable. In this rotation of the shaft 2, the key 15 will encounterthe groove which was free and will at once project thereinto, wherebythe train of cams 14 will once more be rigid with the shaft 2 and thedrive of said set of cams will once more be effective. At the same time,the push-rod 19 is expelled by the action of the flat applied against itand acting as a cam.

The result of this operation is that the setting of the train of cams 14will have been altered with respect to that of the train formed by thecams 3, 4, 5 and 6. This alteration in the setting will obviously beobtained each time that the push-rod 19 is pressed during the rotationof the shaft 2.

The shaft 2 may be extended beyond the upper plate of the frame I toreceive a crank thereon, enabling the device to be operated manually incase of a power breakdown. Also a pulley (or a pinion) may be adaptedthereon to serve for the drive of an accessory device through a drivebelt or chain.

The operation of the apparatus as described is as follows:

The abutment 28 being swung back, the rubber tube 21 is brought oppositeto the push-rods I1, I8 and to the pressure plate I9 by causing it torest in the notches 35" in the supports 39 and 39 which maintain it inproper position (see Fig. l). The abutment 28 is then raised and blockedon the supports 39 and 38 by means If necessary the abutment 28 is thenadjusted. For that purpose the screw 39 is unscrewed and the end of thetube corresponding to the intake side is dipped into a suitable liquid;the apparatus is then started and the screw is tightened until theliquid is aspirated and discharged by the tube. The apparatus is then inadjusted condition. Aspira-` tion and discharge are caused by theassociated action of the pressure-plate I9 and the pushrods I1 and I8.Since the apparatus is reversible, the intake may be effected at willthrough either end of the tube. It will be assumed for example that theleft hand end of the tube (as seen in Fig. 5) is used for intake: Inthis case, the device operates as follows:

The push-rod I1 having been actuated by operation of the cam 5 andlevers Sand 9', until it has completely obstructed or throttled the tube21, the plate I9 which was pressing the tube after it had flattened itout, is retracted by the action of the return spring 24' which pushes Insuch conditions,

.the tube under the eiect oi thefsuction, pro.-

the tube. When the plate I9 has,v been com:-

pletely retracted and consequently the suction eiect has reached .itsmaximum value, the push.- s.

.rod I8. `is brought to the. position causing throttling `f the tube,vWhile the. push-rod I7 on the other hand is retracted. At the same time,the plate I9 is caused to. clamp the tube 21 against the abutment plate2t, thereby causing discharge of the, uid by compression of the tube.rlhis intake and discharge cycle isv repeated' as long asfthe device isin operation.

,If .thedirection 1of rotation of the camslis reversed,v the flow ofduid in the tube is also re versed.

The rate of` ow may beadjusted by means of the screw 2i) with oppositescrew .threads which is adapted to bring the push-1'odsI5 and I5 closerto. or further away from the pivotal axis of` the levers 'I'r and 9';the amplitude of stroke of said pusherods (and therefor that of the.clamping, plate I9) is thus altered. It will be easily understood thatthe more closely spaced are the push-rods with respect to the ends ofthe levers, the Vlarger will be theamplitudev of the. movements of theplates I9; conversely, as said push-rods are brought closer to thefulcrum axes of the levers, said amplitude will be decreased until itbecomes Zero as the push-rods pass exactly through the axis of 'thelevers.

The.y variation of the stroke of the plate |91 is eective toproduce amore or less pronounced collapse of the tube and consequently toalterthe rate of ow. v

It is obvious that this method of adjustment is such that the rate of`flow in each tube is independent from the rate of rotation of the cams.This makes .it'possible to adjust once for -all ysaid rate of rotationand thereby makes it possible to use a synchronous motor permitting astrictly stable rate of rotation and consequently a uniform rate of ow,which is particularly valuable and desirable in medicinal use.

As indicated in the course of the disclosure, the apparatus may beadapted to act on any desiredA number of tubes; when two tubes are used,it may be desirable, to synchronize their deliveries or on the otherhand to cause them to alternate. This possibility makes it possible,Without modifying the rate of rotation of the motor, to double thefrequency of the pumping action. Thus, for instance, if the apparatus isestablished to provide eighty aspirating anddelivery cycles perminutefor each tube, both tubes operating alternately, the totalfrequency will .be brought up to 160 pulsations per minute or may bereduced to 80 if the tubes are operated synchronously, that is if theyaspirate and deliver at the same times.

Inorder to alter the frequency, or in other words to Synchronize theaction of the mechanism in both tubes, or on the other hand to causesuch actionto alternate in both tubes, ,it is simply necessary, theapparatus being in operation, to press Von the .push-rod 19 toautomatically-produce in the above-indicated ,manner a change in therelative setting of .both trains of cams. At each push exerted .on thepush-rod 19, there will be produced a .different combination in thekcon-- trolof the levers acting on said tubes.

The flow indicator shown in Fig. v18., for a given gauge `of tubing,allows the apparatus to. be adjusted so as ,to deliverany desired volume.of liquider gas. 'If lit becomes necessary to use .-a

,istics may kresult from thefact that, therate of ',flow

of the tube ,is varied with Athedisplacement V.01T the push-rods I5 andI6 along the levers 'l' and 8. The counter in question is adptedtoregister the number of strokes or cycles performed by the plate I9. But,sincev those strokes ,are not, all o f the same length it is importantthat the counter should register one vadditional digit `only when thesum of several rstrokesoi? the plate I9 has given rise to the deliveryythrough the tube 21, of a predetermined amount, for instance 1 cc.` Suchlresult is obtained by the'action of the compensating devicewhichoperates as follows; The lever 26 transmits to the lever 52 throughthe medium of the link 25, the impulses received fromjtlie plate I9; inturn the lever 52 drives the ratchet 49 through the-agency of thespring'SD. Asprovlously described' for -one direction .of movement ofthe lever 52, thespring-fis blocked onthe Acylinder 5I and iseffectiveto drive it, while, in the opposite direction, it releases said:cylinder which is then blocked by the spring 53. Each time theratchet'49 has vadvancedby the-amount 'ofl one tooth, the lever48'whi'ch Vtransmits the movement to the counter YII'I througlfialink 48causes one step of advanceof thefunits drum of the counter andthe latterthen totaliz'es the Y-riuinber ofY irripulses. But, when thefpurnp isadjusted, in'such a Vmanner that a certain number 'of strokes of vtheplate I9 iisirequired to produce the 1deli-.very of onel unitof-'volum'e(1`cc.for eX- ample), the gear of the counter only'Y advances, at eachlimpulse receivedfromVv the "lever 26, by an amount `corresponding tothe; amplitude of i the movement o1y said lever (the, leverZBfre'rnaining stationary inthe limitingcase where the plate' I9 isadjusted for a Vrateof flow vthrough the tube equal tenero);each-Strokeofthe plate I9 of'an amplitudesmaljler than that Which'wouldcause the deliver-y of Vone unit volume, feed `the ,ratchet 49, by afraction of atooth space and :saidi ratchet remains in such l3nsit-ion'until a-A I iew` stroke vof theplate I .9. causes Yitfto be fed byanew-fraction. Whenthe total of elementaryrimpulses thus ini-f partedtothe ratchet-49amountsfto one unit, said ratchet is yadvanced by onetooth `and causes the indication ofan additional unit inthe drumsrof thecounter. l a modification of the inventionthe tube of uniform .gaugedescribed abovesreplaced by a tubev comprising, in the `portion:thereorforming theloumpbarrd, a resilient bulb. ion Whichthe pressureproducing-delivery is adapted .to be GX,- erted; in this case, said bulbshould-be actuated on both sides thereof, -and .simultaneously the plateI9 and the abutment zshould be controlled- What I claim is:

1. In a `device iorpumping medicinal uids in combination a nat abutment,surface adaptedto xedly removably receive a length ,oi ,flexible .tub-11115 .thereagainst, a movable guided pressure-plate adapted to be movedtowards :andawayfromsaid 11 abutment surface,` aspring-urged push-rodcooperating with said abutment surface beyond each end of saidvpressure-plate to' throttle a related point of said tube thereagainst, acamshaft With suitably slettable cams thereon, means to rotate said'camshaft, foreach of said pushrods a follower lever,v means co-operatingwith one of ksaid cams tocontrol said push-rod, a pair of levers eachhaving'aflxed fulcrum and provided with a follower arm and an actuatingarm, said follower arm cooperating with a related cam, two movableprojections on said pressureplate each co-,operating with a related oneof said actuating arms and adjustably movable on said pressure plate, inrelation to said fulcrum of said last-mentioned]A levers to cause saidpressureplate to be actuated to a variable degree towards saidabutmentsurface, flow-indicator means including a scale graduation andan indicator arm operatively `connected to said movable projections onsaid pressure-plate to indicate the degree of adjustment thereof withrespect tothe fulcrum points of said last-mentioned levers whereby to beresponsive to the degree of actuation of said pressure-plate, saidoperative connection `including a `cam deviceVw of suitable profilewhereby the displacements'of saidl indicator arm on said scale may belmade to beproportion-al with the actual rates of flow throughk saidtube forthe various degrees of actuation of said pressure-plate, thesetting of said cams 4being such as toI produce: a suitable sequence ofoperation of said pressure-plate and said push-rods to effectively pumpfluidthrough said tube.

2. lIn a device for pumping medicinal fluids in combination 9, flatabutment surface adapted to nxedly receive a length of flexible tubingthereon, a lreciprocable pressure-plate adapted to be reciprocatedtowards and away from said pressureplate, means to adjust the amplitudeof said reciprocation, spring-urged push-rods co-operating with saidabutment: surface beyond each end of said pressure plate to throttle arelated point of said tube thereagainst," a camshaft with suitablysettable cams thereon, an electric motor to drive said camshaftvat aconstant rate, means to control said pressure plate and each oneof saidpushrods from 'a respectiveone of said cams, the setting of said camsbeing such as to cause a predetermined' pumping sequence of operationsof said pressure-plate and said push-rods to pump fluid through saidtube, a counting andl totalizing means to register the total amount offluid pumped through said tube, said means comprising a, registeringwheel, a ratchet adapted when and only when advanced by the space of onetooth to advance said registering wheel by one digit, and means to causeeach actuation of said pressure-plate with'r'espect to said abutmentsur,- 'faceto cause a corresponding ,advance of said ratchetthearrangement beingV such that said ratchetlis caused vto be -advanced bythe amount of onetooth thereof for va number of actuations of saidpressure-plate corresponding to the passing of one unit volume of fluidthrough said tube.

3,.. In a, device for pumping medicinal fluid and the ,likejincombina/tion a flat abutment surface adapted to flxedly receive thereona length of resiliently flexible tubing connecting with a supply offluid to be pumped and with a means for utilizing said fluid, areciprocable pressure-plate adapted to be variably reciprocated towardsand away from said abutment surface to variably throttle said length oftubing, means to iadui? 'lli thel amplitude of reciprocation of saidplate and thereby the degree of throttling of said tube and means toindicate said adjusted amplitude and thereby the amount of fluid flowthrough said tube at each |actuation of said pressure plate,spring-urged push-rods co-operating with said abutment surface beyondeach end of said pressure plate to completely throttle off a relatedpoint of said tube, a camshaft with suitably settable cams thereon,control means from each of said cams to said pressure plate and each ofsaid push-rods respectively to operate the same in a pre-determinedpumping sequence as'determined by the setting of said cams, an electricmotor, a sealed housing for said motor, the lower part of said housingforming an oil sump, gearing connections from said motor to saidcamshaft operating in said oil sump, the arrangement being such as toprevent any escape of said oil from said sump for any position of saiddevice.

4. In the device as claimed in claim 3, means for venting of said sumpto atmosphere to prevent a rise of oil therein under the effect ofpressure of air heated by the operation of the motor.

5. In a device for pumping medicinal fluids and the like in combinationtwo flexible tubes with resiliently collapsible side-walls eachconnected with a respective supply of fluid to be pumped on one hand anda means for utilizing said fluid on the other hand, means for removablysupporting a length of each of said tubes against a flat abutment'surface, for each' of said tubes a pressure plate adapted to be variablyreciprocated towards and awayfrom said abutment surface to variablythrottle said tube thereagainst, means to adjust the degree ofreciprocation of said pressure-plate and means to indicate the degree ofsaid reciprocation and consequently the amount of each fluid flowingthrough each of said tubes at each reciprocation of said pressure-plate,spring-urged push-rods co-operating with said abutment surfaces beyondeach end of said pressure-plate to completely throttle a related pointof each of said tubes thereat, a common camshaft with two series of camsthereon one for each tube, a motor to drive said camshaft, control meansfor one of said cams of each series to a respective pressureplate andfrom cams of each of said series to re-A lated push-rods of a respectivetube, means for setting each of said series of cams so as to cause asuitable pumping sequence of operations of the related pressure-plateand push-rods` to pump said related fluid from said supply to saidutilization means through said related tube, and means for altering therelative setting of both said series of cams with respect toeach otherwhile said camshaft is in rotation, so as to selectively obtain arelative timing such that'said pressureplates and push-rods for bothtubes are operated in unison to simultaneously deliver their respectivefluids through said tubes, or alternatively to obtain a relative timingsuch that the respective fluids` are delivered alternately through bothtubes. y

6. The device as in claim 5, wherein said means for selectively alteringthe relative setting between both said series of cams comprises a pairof angularly spaced longitudinal grooves in said camshaft opposite toone of said series ,of ca-msga retractable key adapted to engage any one.of said grooves selectively to cause Asaid series of cams as a whole tobecoupled withV said camshaft in aA related one of two ',angularsettiogswith respectif@ the Other series of cams. and

13 means for retracting said key while said shaft is in rotation toallow said setting to be automatically altered.

7. In a device for pumping medicinal iiuids and the like in combinationa supporting frame, two flexible tubes each connectable with arespective supply of fluid on one hand and with means for utilizing saidfluid on the other hand, means for removably supporting a length of eachof said tubes horizontally at each side of said supporting frame, anabutment member for each of said lengths of tubes latchable in anoperative vertical position to engage a generatriX of said tube andpivotable to an inoperative horizontal position to enable the removaland insertion of said tube, for each of said tubes a reciprocablepressure-plate adapted to be variably horizontally reciprocated towardsand away from said abutment plate to variably throttle said length oftube thereagainst, means to adjust the degree of reciprocation of saidpressure-plates, and means to indicate said adjusted degree ofreciprocation calibrated in units of volume flow per unit of time,spring-urged push-rods co-operating with said abutment plates beyondeach end of said pressure plates to completely throttle a related pointof said tube thereat, a common vertical camshaft rotatably mountedcentrally of said frame with two series of cams thereon one for eachtube, control means from the respective cams in each series to thepressure plate and the push-rods of a related tube, means for settingeach of said series of cams to cause a suitable pumping sequence ofoperations of said pressure-plates and said push-rods for each tube, andmeans for altering the relative setting between both said series of camswhile said camshaft is in rotation so as to obtain selectively asimultaneous or an alternating delivery of fluid through both tubes,totalizing counter means for registering the amount of uid ow througheach tube, a synchronous electric motor housed under said supportingframe in a casing, an oil sump formed in the bottom of said casingcontaining a substantial amount of oil therein, bearings in said casingfor the driveshaft of said motor, and means to positively prevent saidoil from leaking through said bearings into said supporting frame.

8. The pumping device as in claim 7, wherein said drive-shaft of saidmotor is a tubular shaft co-axially surrounding said camshaft andadapted to drive the latter through a train of gears arranged to work insaid oil-sump.

9. In a device for pumping iiuids in combination a fixed abutmentsurface adapted to iixedly removably receive a length of iiexible tubingthereagainst, one end of said tubing communicating with a source offluid to be pumped and the opposite end with a means for utilizing saidduid, a reciprocable pressure-plate to be moved towards and away fromsaid abutment surface, guiding means for said pressure-plate, rstpushrods each having an end engaging said pressureplate, second pushrods each cooperating with said abutment surface beyond each end of saidpressure-plate adapted when actuated to flatten out and throttle arelated point of said tube against said abutment surface, guiding meansfor said first and second push-rods, spring means for urging said rstand second push-rods away from said abutment surface, a rotatablecamshaft, settable cams on said camshaft, follower levers cooperatingwith each one of said cams, pins associated with and secured to arelated one of said levers respectively, actuating levers xed on each ofsaid pins and each cooperating with a related one of said push-rods, andmeans for displacing said rst push-rods in reverse directions withrespect to each other substantially along the related ones of saidactuating levers thereby causing said pressure-plate to be moved to avariable extent from said pins through said actuating levers accordingto the adjustment of said rst push-rods with respect to their associatedactuating levers, the setting of said cams being such as to provide fora predetermined pumping sequence of operation of said pressure-plate andsaid second push-rods to cause pumping of said fluid from said source tosaid utilization means, and a constant speed driving mechanism foroperating said camshaft.

HENRY, LOUIS JOSEPH.

REFERENCES CITED The following references are of record in the file of.this patent:

'UNITED STATES PATENTS

